The muffler comes with the quiet insert as shown in the drawing and a separate spark arressor that looks like it can only be used without the quiet insert. The quiet insert itself does not have a spark arrestor (it is just a smaller pipe). Therefore, if you put the quiet insert in it, it will be quiet but it will not have a spark arrestor. If you put the spark arrestor in, you will be without the quiet insert. This is a design flaw to me, but I do not use the quiet insert so it is not a problem (I do not use the spark arrestor either). I read someone else state this too, so I am pretty sure I am correct on this and I just looked at the parts to confirm. The pipe on the quiet insert is longer than the depth of the spark arrestor, and thus they cannot both go in unless maybe you had the spark arrestor protruding outside of the muffler in the backwards way.
After looking at the ebay deal onthe new Leo-Vince, I contacted them. I contacted the Leo-Vince seller ( The seller is directly from Leo-Vince) on ebay and then I called Leo-Vince by phone. Here is the ebay seller's direct words:
Yes, there should be a quiet core insert that is included that will allow you to run the insert along with the spark arrestor. Hope this helps. Let me know if you have any other questions.
The person on the phone( Keep in mind I asked about the motocross muffler only) said that the quiet core and spark arrestor wouldn't work together, but they make a quiet core/spark arrestor-in-one insert. But,t he employee on the phone told me that the quiet insert would not do anything for me since they already make the muffler under 94db, and that all I would need is the quiet insert.
Some people may thing I am dragging this out and should have bought an exhaust
weeks ago. I really want to make the correct decision on which to buy. If you are thinking I should just buy the Q4 and quit asking questions, I am more interested in the Jardine
or Leo-Vince because of their quality and I have never heard of issues with either exhaust, and I can't say the same about FMF.
I appreciate all of the help I have been given